Why Do Black Holes Twinkle? Scientists Studied 5,000 Star-Eating Behemoths to Find Out

Black holes are bizarre things, even by the standards of astronomers. Their mass is so great, it bends space around them so tightly that nothing can escape, even light itself. And yet, despite their famous blackness, some black holes are quite visible. The gas and stars these galactic vacuums devour are sucked into a glowing […]